Static balancing-machine.



N. W. AKINIOFF.

STATIC BALANCING MACHINE.

APPLICATION FILED AUG. I5. I9I6 RENEWED JULY 6. |918.

1,296,609. Patented Mar. 1I, 1919. FA V l 2 SHEETS-SHEET I.

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N. W. AKIIVIOFF.

STATC BALANCING MACHINE.

APPLlcAnoN F1150 Au. 15. 1916. RENEwEn JULY 6.1918.

1,296,609. Patented Mar. 11,1919.

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@Hom/mu NICHOLAS w. Amour, or PHILADELPHIA, PENNSYLVANIA, AssIGNoE :ro DYNAMIC BALANcnvemAcHINE COMPANY, oF PHILADELPHIA, PENNsYLvANIA,A conPonA- TIoN 'or' PENNSYLVANIA.

STATIC BALANCING-MACHINE.

Specification of Letters Patent.

Application inea August 15, 1916, serial No. 114,986. Renewed Juye, 191s. seriai No. 243,701.-

To all whom zt may concern.'

Be it known that I, NIcHoLAsW. Axi- Morr, asubject ofthe Czar of Russia, rey siding at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Im provements in Static Balancing-Machines, of which the following is a specication.

The object of this invention is to provide a machine by which it is possible to test bodies for the .condition of vstatic balance, and to indicate the degree thereof. By static balance of a rotatable body is understood the coincidence of the center` of gravity of said body with one of the points lying upon its axis of rotation. l

The means heretofore employed for securing this condition lof balance are all based upon principles in which frictional resistances are always present to a certain degree', wherefore the results are never perfect. Such means as have been known and employed are z-parallel ways, rollers, and simiar apparatus. l

The present invention contemplates anvarrangement consisting of a vibratory beam pivoted at one' end and supported by a suitable spring, or springs, at the other. A rotary body (R) is then placed with its axis of rotation perpendicular to the plane of oscillation of the said beam and is arranged in pillow blocks or other bearingsmounted on thesaid beam in such a manner 'that the distance (a) between the paraltated in its bearings to oscillate the said' beam; In fact, the centrifugal force of the center of gravity of the body, taken in conjunction with the leverage a creates a couple with a certain moment about the said pivot, or-hinge, varying according .to the pla-ne plendulum, or. simple harmonic motion aw, w e'n the frequency of the forced vibration of the beam becomes of the same period as the rotation of the body.

Regardless, for the present, of the means by which the rotation is accomplished,'if it were possible to provide a couple of the same varying moment, but negatively located, and having an axis parallel to the plane o f oscillation, there would be a state or condition of equilibrium under all speeds. This is accomplished by means of Aa cage, or any other device, capable of producing a certain centrifugal couple equal to MRC/wz, wherein fw' is the same as for the bod R. If now under a certain adjustment o the cage, the beam stops vibrating, then in view of the equilibrium, mrw2a=MR/w2C.

Hence, knowing M, R, C Iand a, we have the product m7 for thebody, as well as the axial plane in which this surplus weight is located. With these factors positively dealthough this is merely a matter of practice and not of principle. Furthermore, by this lconstruction and operation the friction between the coperating parts in no way prevents a positive manifestation by the body of the slightest degree of static unbalance.

. The details of the construction and operation of the preferred form of the invention areclearly brought out in the Afollowing description, when read in conjunction with the 'accompanying drawingsin which Figure l is al front elevation of the preferred embodiment of the invention; Fig. 2 is an end elevation of the same; Fig. 3 is a ldiagrammatic view showin the geometrical relation of the physical bo 'es involved; Fig. 4 is an.

enlarged-detail View of the dynamically adjustable balancing mechanism; Fig. 5 is a vertical transverse section of the same.

Referring to the drawings, a bed 1 is provided, and pivotally supported by a frame 2 having legs 3 by means of a resilient member 4, transversely reduced in cross-section at 5 to localize the point of greatest yield. At another part of the said bed the same is supported by and spaced vfrom the said frame by one or more suitable spring members 6, having a predetermined natural period of vibration under a given load, though said period may be varied by vany suitable means, as by adjusting the position upon the device of a weight, such as that'described in application Serial No. 110,275.

` Rigidly carried by the bed 1 and adjacent to one end thereof is a pair of bearing blocks 9, revolubly carrying a shaft 10 in turn provided with a pulley 11, which latter is adjustably secured to said shaft by means of any suitable clutch mechanism12. Also secured to the said shaft is a squirrel cage comprising spaced plates 13, between which extend spacing rods 14 carrying slidably positioned rods or weights' 15, in turn adjusted longitudinally of thecage by means of wheels 16 provided with radially extending vanes 17, adapted to be actuated by friction means 18, or fluid pressure, as they revolve past the same during the rotation of said cage, said weights or. supporting rods being graduated'in special units representing the turning moment 'o f the object to he tested about its axis, the length of such unit being dependent upon the particular balancing machine.

At the farther endAof vthe bed 1 the same is preferably extended laterally at 22 and provided with a trackv 23 upon which are slidably positioned bearing blocks 24, in turn carrying a rotatable shaft 25 adapted to support a body 26, the static balance'of which is to be tested. Upon one ofthe extensions 22 is rigidly mounted a head stock v27, lcarrying an auxiliary shaft 28 with a pulley 29, anda chuck 30 adapted to grip the adjacent end of the shaft 25 to revolve the latter. l

Upon and secured to the under side ofthe lbed A1 is a motor 34, the shaft 35 of which carries a pulley 36, between which and the pulley 11 extends a belt 37 or the like, and a bevel gear 38 meshing with a similar gear 439 upona shaft .40, extending at right angles to the said shaft35, and carrying a pulley 41 connectedto the pulley 29 by -means of a the ba ance of the said body being'tested is determined, while to facilitate the operation the said balancing cage as shown is provided with three such pairs.

If then a superfluous amount of material exists on, or as an integral part of, said v body, but in a lane other than those correspending to t eoriginal positions of the- *Said pairs of welghts, the said cage is revolved about its'shaft 10 through the desired number of 'degrees by the *Y same with. the clutch` mechanism' 12, after which alteration the said mechanism isI again made secure, and the operation above described is repeated. In this manner the exact position of the cause ofunbalan'ce is: readily ascertained, landthe operation isl greatly facilitated when the device is provided with an azimuth changing mechamsm,

cation Serial No. 110,276.

such for instance as that described appli-,

In the operation of this device in the manner above described it is to be noted that friction in no way plays a art', except to take upa small portlon of t e effective power of the driving unit; in otherwords,

the vibration of the bed, due to the slightest possible degree of unbalance of the body when revolved at high speeds, is positive and for all practical purposes entirely unrestrained, until the unbalancingcause 1s nullified or counteracted by the proper adjustmentof the cage weightsv as above described. To test out the eiiiciency of the device, the superfluous material is removed and the system again revolved with the 'cageweights all in their respective'vneutral positions.

In constructing the device, the axis of rotation of the cage may be in any position within a plane perpendicular to the axis of oscillation of the bed, but it is essential that theaxis of rotation of the lbody being tested shall be parallel to the said axis of ,oscillation, or that the said body shall' rotate in a plane perpendicular to said latter axis.

Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States is :-k

1. The method which consists in associating a statically unbalanced body with a body adjustable to be perfectly balanced dynamically so that the two revolve synchronously, and form part of an unbalanced movable system, and then adjusting said last-named body while said system is in motion, to neutralize the unbalanced condition of said first body to balance said system.

2. The method which consists in. associating. a statically unbalanced body, with an adjustable body adapted to indicate numerically the degree of unbalance of the first so that the two are arranged to revolve synl chronously, and to'form parts of an unbalanced movable system, and then adjusting said last-named body while said system is in motion, to neutralize the unbalanced condition of said first body to balance said System. Y

3. The method which consists in associating a statically unbalanced bod with an adjustable body operative to in icate the degree of unbalance 0f the first so that the two are arranged to revolve synchronously, to

form parts of an unbalanced movable system, thel axis of one of said bodies being perpendlcular to the axis of the other, and

' then `adjusting said last-named bod while said system is in motion, to neutra ize the justable bod operative to in icate the degree` of unba ance of the first so that the two are arranged to revolve synchronously and to form an 'unbalanced system, the axis of one of Said bodies being perpendicular to the axis of the other, and with the said system mounted to vibrate in a plane perpendicular to the plane of rotation of saidsecond body,

and then' adjusting said ladjustable body while said system is in motion, to neutralize the unbalanced condition of said irstbody to balance` said system and indicate the deee of unbalance of said second body.

5. A static balancing machine, comprisng a rotatablel support for a body to be tested, a second body, means whereby said second body is adjustablyv supported to rotate upon an axis perpendicular to that of the body to be teste an oscillator carrying said body supports and adapted to oscillate upon an axis parallel with the axis of said firstnamed support and perpendicular to that of the second support, and means whereby said supports are connectedto revolve synchronously thus forming with said -oscillator an oscillating system.

6. A static balancing machine, comprising a bed, a rotatable support for a body to be tested mounted upon said bed, and adjustable means also carried by said bed and adapted to be rotated synchronously with said support to statically balance a body connected therewith, said support and said means being rotatable @upon axes per pendicular to each other.

7. A -static balancing machine, comprising a bed, a rotatable support for a body to be tested mounted upon said bed, and ad-4 justable means also carried by said bed and adapted to be rotated synchronously with said support to balance a body connected withsaid support, said support and said body having a common' axis of voscillation perpendicular' to the plane of rotation of said support.

8. A static balancing machine, com rising a bed mounted tooscillate upon a ed axis, a revoluble support for a body to be tested mounted upon said bed, means rotatable in a plane parallel with the axis of oscillation of said bed-lV and:- comprising weights adjustable while said meansis in motion to create a couple operative to counteract the unbalanced condition of a body upon said support, and means to rotate said support and said first means synchronously.

9. A static balancing machine, com rising a bed mounted to oscillate upon a ed synchronism.

axis, a support for a body to be tested carried by said bed and revoluble in a plane perpendcularto said axis, rotatable means also carried by said bed and adapted to create a. centrifugal couple operative to counteract the unbalanced* condition of a body upon said support, and means to rotate said support and said first means in 10. A static balancing machine, comprising a bed mounted to oscillate upon a fixed axis, a support for a body to be tested carried by said bed and revoluble in a plane perpendicular to said axis, rotatable means also carried by said bed and adapted to create a centrifugal couple to counteract the unbalanced condition of a body upon .said support, said means comprising longitudinally adjustable weights movable while said means is in motion, and means. to rotate said support and. said rst'means in synchronism. l

11.v A balancing machine, comprising an oscillatory mounting, means for rotatably supporting avbody to be tested and carried by said mounting, rotatable means also carried by andadapted to impose a forced v1'- bration upon said. mounting and c'onnections whereby said last means is revolved in harmony with a body upon said first means, the whole being operative to test the static balance of a body upon said rst means.-

12. A balancing machine, comprising anv oscillatory mounting, means for rotatably supporting a body to be tested and carried by said mounting, means adapted to be balanced and unbalanced dynamlcally, also carried by said mounting, and connections whereby said last means is revolved in harmony with a body upon said first means, the wholeibeing operativeto testi-the static balance of a body upon said first means.

13. The method which consists in associating a statically unbalanced body, with a body adjustableto be perfectly balanced or unbalanced at will so that the-tworevolve synchronously, and form parts of an unbalanced movable system, then adjusting said last-named body dynamically to' neutralize the mnbalanced .condition ,of (said first body statically to balance said system. l

14. The method which consists in associating a statically unbalanced body, with an adjustable body upon an oscillatory support,

said last-named bodybeing adjustable to be perfectly balanced and unbalanced at will, so that the two may be rotated 1n harmony,

and form parts of an unbalanced movable system, rotating said bodies, and -then adjusting said last-named body to neutralize the statically unbalanced 'condition of said first body to balance said system.

15. A balancing machine, comprising an oscillatory mounting, a support upon said mounting for a rotatable body to be tested statically, an adjustable rotatable means adapted to be perfectly balanced statically and'toimpose upon said mounting. and said support forced vibrations of variable amplitude, and connections whereby the body upon.. saidsupport and said means are rotatable synchronously'.

16. A balancing machine, comprising an oscillatory support for a body to be tested statically, an 'adjustable rotatable means adapted to be perfectly balanced statically and to impose upon said support forced Vibrations of variable amplitude, and connecltions whereby the body upon said-support and said means are rotatable in synchronism.

17. The method which consists in mechanically associating a statically unbalanced body with a body adapted to be perfectly balanced and unbalanced dynamically at will so that each tends to oppose the tendency of the other to vibrate'if unbalanced, and so that the two may be revolved synchronously, thus forming an unbalanced system, and then adjusting said lastnamed body to neutralize the unbalanced condition of said rst body to balance said system.

In testimony whereof I have aflxed .my signature. v

NICHOLAS W. AKIMOFF. 

